geotropismPronunciation: /ˌdʒiːə(ʊ)ˈtrəʊpɪz(ə)m/Definition of geotropism noun [mass noun] Botany the growth of the parts of plants in response to the force of gravity. The upward growth of plant shoots is an instance of negative geotropism; the downward growth of roots is positive geotropism. Derivatives geotropicPronunciation: /dʒiːə(ʊ)ˈtrəʊpɪk, -ˈtrɒpɪk/ adjective Origin: late 19th century: from geo- 'earth' + Greek tropē 'turning' + -ismgeotropism in other Oxford dictionaries Definition of geotropism in the US English dictionary
